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How the domain-based connection works
SSH does not connect to a domain as a separate transport. Your SSH client first asks DNS for the network address behind the hostname. It then opens an SSH connection to that address, normally on TCP port 22 unless you specify another port.
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For example, ssh.example.com can resolve to 203.0.113.10. The command ssh [email protected] therefore reaches the same VPS that you could reach with ssh [email protected]. A hostname is easier to remember and can continue to point to the server if its public address changes, but it does not provide authentication or encryption by itself. SSH encryption and host-key verification still protect the session.
Information to collect before changing DNS
Have these values ready from your VPS provider or server administrator:
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| Item | What to record | Why it matters |
|---|---|---|
| Public IPv4 address | The VPS address reachable from the internet | Used in the DNS A record and as an emergency direct-connect address |
| Public IPv6 address | Only if the VPS has working IPv6 connectivity | Used in an AAAA record; an unreachable IPv6 record can cause failed or delayed connections |
| SSH username | The account permitted to log in | The username is part of the SSH command and must match the server configuration |
| Authentication method | Private-key path, password, or both | Determines whether you need -i, a passphrase, or a password |
| SSH port | Usually 22, or the custom port configured in sshd |
The DNS record does not specify a port; a custom port must be supplied separately |
Provider documentation commonly lists the IP address, username, and authentication method as the basic connection information. Do not assume that the account name used by one VPS image works on another; use the account supplied for this instance.
Choose a hostname for SSH
Use a name in a DNS zone that you control. A dedicated subdomain such as ssh.example.com is usually clearer than reusing the website’s apex name. It separates the administrative endpoint from web traffic and lets you move the website and server independently.
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Create the DNS record
Add an A record for IPv4
- Open the DNS management panel for the zone containing your domain.
- Create a record with type
A. - Enter the host or name field as
sshif the panel appends.example.comautomatically. Otherwise enter the full hostnamessh.example.com. - Set the value to the VPS public IPv4 address.
- Leave the record un proxied if your DNS provider offers a web-proxy toggle that is not intended for arbitrary SSH traffic. A plain DNS answer must return the VPS address directly.
- Save the record and note the TTL shown by the provider. Resolvers can cache the old answer until that TTL expires.
Do not put a port number in an A record. A value such as 203.0.113.10:2222 is not a valid IPv4 address for this purpose.
Add an AAAA record only for usable IPv6
If the VPS has a publicly reachable IPv6 address and the client network supports IPv6, add a separate AAAA record for the same hostname. The value must be the IPv6 address, not an IPv4 address. Do not add an AAAA record merely because the provider displays an IPv6 address: the server firewall, routing, SSH listener, and client network must all support it.
An incorrect or unreachable AAAA record can make a hostname appear broken even when its A record is correct, because some clients try IPv6 first. Remove or correct the AAAA record if IPv6 is not actually available.
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DNS changes are cached by recursive resolvers. There is no universal propagation time: visibility depends on the record’s previous TTL, resolver caches, and the DNS provider’s update process. Test the name from the same network and device that will run SSH instead of assuming that a successful lookup from the DNS dashboard means every resolver has updated.
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Check with dig
On Linux, macOS, or another system with BIND utilities, run:
dig +short ssh.example.comAn IPv4 result should show the VPS address. To request only IPv4 or IPv6 answers, use:
dig A +short ssh.example.com
dig AAAA +short ssh.example.comAn empty result means that the queried resolver did not return that record. A different address means the record is not yet updated, is being overridden by another record, or was entered in the wrong DNS zone.
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Check with nslookup or getent
If dig is unavailable, use:
nslookup ssh.example.comOn many Linux systems, getent hosts ssh.example.com shows the addresses returned through the system resolver. Compare the output with the VPS address you recorded. Check spelling carefully; a missing label, extra dot, or wrong domain is enough to produce a hostname-resolution error.
Test the address without SSH
Once DNS returns an address, test whether the selected TCP port is reachable:
nc -vz ssh.example.com 22Replace 22 with the configured port. A successful DNS lookup and a failed port test are different problems: the name can be correct while a firewall or stopped service blocks the connection.
Connect with OpenSSH
Default port and an account using the default key location
Run:
ssh [email protected]OpenSSH looks for keys in its normal locations, including ~/.ssh/id_ed25519 and other configured identities. If the correct key is there and the server accepts it, SSH asks for the key’s passphrase, not the VPS account password.
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Specify a private key explicitly
Use -i when the key is stored elsewhere or you want to select one identity deliberately:
ssh -i ~/.ssh/id_ed25519 [email protected]Protect the private key from other local users. On Unix-like systems, a key that is broadly readable may be rejected by OpenSSH; restrict it with:
chmod 600 ~/.ssh/id_ed25519Use the actual path and filename for your key. Never copy a private key into DNS settings or send it to a server administrator through an untrusted channel.
Use a custom SSH port
If sshd listens on port 2222 instead of port 22, the command is:
ssh -p 2222 [email protected]With an explicit key and port:
ssh -i ~/.ssh/id_ed25519 -p 2222 [email protected]Changing the port does not replace key-based authentication, firewall rules, account controls, or updates. The provider firewall and the operating-system firewall must both allow the selected port.
Save the settings in SSH config
For regular use, put the connection details in ~/.ssh/config:
Host my-vps
HostName ssh.example.com
User username
Port 2222
IdentityFile ~/.ssh/id_ed25519After saving the file, connect with:
ssh my-vpsKeep the file private and verify its indentation if OpenSSH reports a configuration error. The HostName is the DNS name; Port remains a separate setting because DNS does not carry port information.
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Verify the host key on the first connection
On the first connection, OpenSSH normally reports that the server is not yet identified on your local machine and asks whether to continue. Before accepting, compare the fingerprint shown in the prompt with a fingerprint obtained through a trusted channel, such as the VPS provider’s console or a console session you already trust.
Accepting the key saves it in your local known_hosts file. Later connections compare the server’s presented key with that saved value. A changed-key warning must not be dismissed automatically. It can occur after a legitimate rebuild when a reused address receives a new server key, but it can also indicate that traffic is being intercepted.
If you have confirmed that the VPS was rebuilt and that the new fingerprint is correct, remove the old entry with:
ssh-keygen -R ssh.example.comConnect again and verify the newly displayed fingerprint before accepting it. If you cannot explain the change, stop and investigate through the provider console or administrator rather than deleting the warning.
Authenticate and end the session
After the host-key check, SSH authenticates the account. Enter the private-key passphrase or account password requested by the server. A successful login normally presents the remote shell prompt.
When finished, close the session cleanly:
exitIf the connection drops unexpectedly, reconnect using the same hostname and port. The domain name remains a lookup alias; it does not preserve a session or change the server’s account permissions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot the common errors
Could not resolve hostname
An error such as ssh: Could not resolve hostname ssh.example.com: Name or service not known means the client could not map the name to an address. It occurs before SSH authentication.
- Check every character of the hostname and the command’s spelling.
- Run
dig +short ssh.example.comornslookup ssh.example.comfrom the affected client. - Confirm that the A or AAAA record exists in the authoritative DNS zone for the domain.
- Check whether the record was entered under the provider’s expected host format; some panels want
ssh, while others want the full name. - Wait for cached answers to expire and test with another resolver if appropriate.
- Use the VPS IP temporarily if you must connect before DNS is corrected.
DNS resolves, but the connection times out
A timeout usually means the address was found but no response returned from the selected port. Check that:
- The VPS is powered on and has a working public route.
- The port in the SSH command matches the port configured in
sshd. - The VPS provider’s network firewall allows inbound TCP traffic on that port.
- The operating-system firewall allows the port and does not restrict your client address.
- Your current network permits outbound SSH traffic.
- An IPv6 answer is not sending the client toward an unreachable IPv6 path.
Test the port with nc -vz ssh.example.com 2222, replacing the example port. If the direct IP also times out, DNS is not the primary problem.
Connection refused
Refusal means the address was reachable but no service accepted the selected port. On the VPS console, check whether the SSH daemon is running and listening, and confirm the configured port. If the daemon listens on 2222 while the command uses the default 22, use -p 2222 or correct the server configuration. A firewall that actively rejects a port can also produce refusal.
Permission denied
The network path worked, but authentication failed. Verify:
- The username is the account created by the VPS image or administrator.
- The
-ipath points to the matching private key. - The private key permissions are restrictive enough for OpenSSH to use it.
- The corresponding public key is present in the account’s
authorized_keysfile. - Password authentication is enabled only if you intentionally rely on it and the password is correct.
- You are not accidentally offering a key for a different server or account.
Use verbose mode to see which stage fails without exposing private-key contents:
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Host key changed warning
Stop at the warning and verify the server identity. Rebuilding a VPS can legitimately replace its host key, especially when an address is reused, but an unexpected change has the same warning because SSH cannot distinguish a rebuild from interception. Confirm the new fingerprint through a trusted console before using ssh-keygen -R.
Quick Recap
Choose between the main connection options
| Option | Use it when | Important difference |
|---|---|---|
| A record | The VPS is reachable over IPv4 | Maps the hostname to an IPv4 address |
| AAAA record | The VPS and client both have working IPv6 | Maps the hostname to IPv6; do not publish an unreachable address |
| Port 22 | The server retains the standard SSH listener | Works with the simplest command and common tooling |
| Custom port | The administrator configured SSH elsewhere | Requires -p or a Port entry in SSH config and matching firewall rules |
| Password authentication | Keys are unavailable or a provider requires an initial password login | Convenient, but exposed passwords can be guessed; follow the server’s password policy |
| SSH key authentication | You control a private key and can install its public key | Supports passphrases and avoids sending an account password during login |
| Direct public VPS | The VPS can safely accept SSH from your client network | One public endpoint to protect with firewall and authentication controls |
| Private VPS through a bastion | The target has no public SSH endpoint | Requires a reachable jump host and an additional SSH hop, commonly configured with ProxyJump |
Security practices that remain necessary
- Prefer key-based authentication where the server supports it, and protect the private key with a strong passphrase.
- Verify the host fingerprint through a trusted channel on first connection and after any rebuild or key-change warning.
- Restrict inbound SSH at both the provider firewall and the VPS firewall where practical.
- Use a dedicated administrative hostname rather than assuming a website name identifies the correct server.
- Keep the SSH daemon and operating system updated according to the server administrator’s maintenance process.
- Do not treat a domain as an authentication control. Anyone who can alter the DNS record can redirect the name to another address; host-key verification is what reveals an unexpected server.
- Keep a direct IP or provider-console recovery path documented in case DNS fails.
A repeatable checklist
- Record the VPS public IPv4 address, usable IPv6 address if applicable, username, authentication method, and SSH port.
- Create
ssh.example.comor another hostname in a DNS zone you control. - Add an A record for IPv4 and add AAAA only when IPv6 is genuinely reachable.
- Query the name with
dig,nslookup, orgetentfrom the client. - Run
ssh [email protected], adding-ifor a non-default key and-pfor a custom port. - Compare the first-connection fingerprint with a trusted provider or console record.
- Authenticate, confirm the expected remote account, and end the session with
exit. - If it fails, classify the error as DNS resolution, network timeout, refused port, authentication failure, or host-key mismatch before changing settings.
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